#include<iostream>
#include<list>
using namespace std;

int main()
{
	list<char> coll;  //list container for character elements

	//append elements from 'a' to 'z'
	for(char c='a';c<='z';c++){
		coll.push_back(c);
	}
	
	//print all elements
	while(!coll.empty()){
		cout<<coll.front()<<" ";
		coll.pop_front();
	}
	cout<<endl;
	return 0;
}